The dumbbell bench press will target the middle part of the chest.

Muscles Involved in order of importance:

Chest (pectorals)

Front Delttoids (shoulders)

Triceps

To perform this exercise lie back onto a flat bench and take hold of a pair of dumbbells, and hold them straight up above your head.
Then lower the dumbbells slowly untill you can feel a strech in your chest keeping the weights in a controlled movement and do not forget to breath in. ,
Push the weights straight up to the starting posistion untill your elbows are locked out and remember to exhale as you do this.

Safety: Doing this exercise should be done with a spotter if you think the weight will be a bit too much, I also have a spotter when doing this exercise just to be on the safe side.